/* ベース */
body {
  margin: 0;
  font-family: "Noto Serif JP",serif;
  background: #111;
  color: #eee;
  line-height: 1.0;
}

/* 麻の葉背景 */
body {
  background-color: #111;
  background-image:
    linear-gradient(30deg, #222 12%, transparent 12.5%, transparent 87%, #222 87.5%, #222),
    linear-gradient(150deg, #222 12%, transparent 12.5%, transparent 87%, #222 87.5%, #222),
    linear-gradient(30deg, #222 12%, transparent 12.5%, transparent 87%, #222 87.5%, #222),
    linear-gradient(150deg, #222 12%, transparent 12.5%, transparent 87%, #222 87.5%, #222),
    linear-gradient(60deg, #333 25%, transparent 25.5%, transparent 75%, #333 75%, #333),
    linear-gradient(60deg, #333 25%, transparent 25.5%, transparent 75%, #333 75%, #333);
  background-size: 40px 70px;
  background-position: 0 0, 0 0, 20px 35px, 20px 35px, 0 0, 20px 35px;
}

/* 市松模様
body {
  background-color: #111;
  background-image:
    linear-gradient(45deg, #1a1a1a 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #1a1a1a 75%),
    linear-gradient(45deg, #1a1a1a 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #1a1a1a 75%);
  background-size: 40px 40px;
  background-position: 0 0, 0 0, 20px 20px, 20px 20px;
} */

/* ヘッダー */
.logo {
  margin: 0;
  font-size: 28px;
  color: #d4af37; /* 金色 */
  letter-spacing: 4px;
}

.nav a {
  color: #eee;
  margin-right: 20px;
  text-decoration: none;
  font-size: 14px;
}

.nav a:hover {
  color: #d4af37;
}

/* レイアウト（スマホ） */
.container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  padding: 20px;
}

/* 記事カード */
.post {
  background: #1a1a1a;
  padding: 20px;
  border-left: 4px solid #d4af37;
}
.post-card {
  text-decoration: none;
  color: white;
}

/* サイドバー */
.sidebar {
  background: #1a1a1a;
  padding: 20px;
  border-left: 4px solid #b33a3a; /* 朱色 */
}

/* フッター */
.footer {
  text-align: center;
  padding: 20px;
  color: #777;
  border-top: 1px solid #444;
}

/* タブレット以上 */
@media(min-width: 700px) {
  .container {
    grid-template-columns: 2fr 1fr;
  }
}

@media(min-width: 700px) {
  .posts {
    grid-template-columns: repeat(2,1fr);
  }
}

@media(min-width: 1000px) {
  .posts {
    grid-template-columns: repeat(3,1fr);
  }
}

/* ハンバーガー（スマホ表示） */
.hamburger {
  display: block;
  width: 30px;
  height: 22px;
  position: relative;
  background: none;
  border: none;
  cursor: pointer;
}

.hamburger span {
  position: absolute;
  left: 0;
  width: 100%;
  height: 3px;
  background: #d4af37; /* 金色 */
  transition: 0.3s;
}

.hamburger span:nth-child(1) { top: 0;}
.hamburger span:nth-child(2) { top: 9px;}
.hamburger span:nth-child(3) { top: 18px;}

/* メニュー（スマホでは非表示） */
.nav {
  display: none;
  flex-direction: column;
  background: #000;
  padding: 20px;
  border-top:  1px solid #444;
}

.nav a {
  padding: 10px 0;
  color: #eee;
}

/* メニュー表示時 */
.nav .active {
  display: flex;
}

/* ハンバーガー → Xに変形 */
.hamburger .active span:nth-child(1) {
  transform: translateY(9px) rotate(45deg);
}
.hamburger .active span:nth-child(2) {
  opacity: 0;
}
.hamburger .active span:nth-child(3) {
  transform: translateY(-9px) rotate(-45deg);
}

/* PCではハンバーガー非表示、メニュー横並び */ 
@media (min-width: 700px) {
  .hamburger{
    display: none;
  }

  .nav {
    display: flex;
    flex-direction: row;
    background: none;
    border: none;
    padding: 0;
  }

  .nav a {
    margin-left: 20px;
  }
}

/* 記事詳細のページのレイアウト */
.single-container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  padding: 20px;
}

/* 記事本文 */
.single-post {
  background: rgba(0, 0, 0, 0.6);
  padding: 25px;
  border-left: 4px solid #d4af37;
  backdrop-filter: blur(2px);
}

.single-title {
  margin-top: 0;
  font-size: 28px;
  color: #d4af37;
  letter-spacing: 3px;
}

.single-data {
  color: #aaa;
  font-size: 14px;
  margin-bottom: 20px;
}

.single-thumb {
  width: 100%;
  border-radius: 4px;
  margin-bottom: 20px;
}

/* タブレット以上 */
@media (min-width: 700px) {
  .single-container {
    grid-template-columns: 2fr 1fr;
  }    
}